Use the battery maker's recommendations for the charging rate. Here is what ThunderPower has to say about it:

"..(7) NORMAL CHARGING: The charge rate should not exceed 1C (one times the capacity of the battery, unless otherwise noted*). Higher setting may cause problems which can result in fire. For example: Charge a 730mAh battery at or below 0.73Amps. Charge a 5000mAh battery at or below 5Amps. Thunder Power packs with balancing connectors can be used with TP balancers for safer charging. For
more information, please visit: www.thunderpowerrc.com

*To charge at greater than 1C (no more than 3C): You must use a Thunder Power 1010C charger in conjunction with a Thunder Power Balancer (205 or 210) and data cable. Only ProLite 910, 1320, 2000 and 2100 cells qualify for charging up to 3C."

Note that *only* the top of the line ProLite cells can be charged at up to 3C. I still would not do it unless I was waiting to use the cell, it is going to take some life out of the battery and it just does not make sense to use high rates needlessly.